One student spoke with KHOU sister station WFAA and said she was in the C Building when she heard three gunshots before running out of the school.

Another witness said officers with high-powered rifles were going room to room searching for the suspect.

A student named Mike spoke to WFAA and said he heard people yelling in a hallway, and a man entered the room he was in, turned off the lights, and locked the door. He also heard police officers telling people to get down, and said officers entered the room and had students leave with their hands over their heads.

Some students have taken to social media to talk about the incident:

I've never been so scared. There is legit yelling and running in my hallway.